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Ultra-low load stable combustion method and device for coal-fired boiler

A technology of a coal-fired boiler and a stabilizing combustion device, which is applied in the combustion method, the burner for burning powder fuel, the burner, etc., can solve the problem that the coal-fired unit is difficult to maintain stable combustion, and achieves easy on-site renovation and high burnout rate. , fast response effect

Pending Publication Date: 2022-07-22
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that it is difficult for coal-fired units to maintain stable combustion during deep peak-shaving and low-load operation, the present invention provides a method and device for stable combustion of coal-fired boilers with ultra-low loads

Method used

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  • Ultra-low load stable combustion method and device for coal-fired boiler
  • Ultra-low load stable combustion method and device for coal-fired boiler

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Experimental program
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Effect test

Embodiment 1

[0036] The ultra-low-load stable combustion method for a coal-fired boiler based on the partial gasification of ultra-fine pulverized coal involved in this embodiment includes the following steps: using high-activity Shenmu bituminous coal as a raw material;

[0037] In step 1, the raw coal is sent to the ultra-fine coal mill 1, and the raw coal is ground into ultra-fine pulverized coal with a particle size of less than 45 μm, of which the ultra-fine pulverized coal with a particle size of less than 10 μm accounts for ~ 55%; air is carried by adjusting the air volume. The ultrafine coal powder is discharged from the top of the ultrafine coal mill 1; the mass ratio of air to ultrafine coal powder is 3.5:1;

[0038] Step 2, the air carries the ultra-fine coal powder and is injected into the gasifier 3 from the central channel 10 of the burner 2 at the top of the gasifier; the gas flow rate at the outlet of the central channel 10 is controlled to be 40 m / s;

[0039] Step 3, ignit...

Embodiment 2

[0044] The ultra-low-load stable combustion method for a coal-fired boiler based on the partial gasification of ultra-fine pulverized coal involved in this embodiment includes the following steps: using high-activity Inner Mongolia lignite as a raw material;

[0045] In step 1, the raw coal is sent to the ultra-fine coal mill 1, and the raw coal is ground into ultra-fine pulverized coal with a particle size of less than 45 μm, of which the ultra-fine pulverized coal with a particle size of less than 10 μm accounts for ~50%; air is carried by adjusting the air volume. The superfine coal powder is discharged from the top of the superfine coal mill 1; the mass ratio of air to superfine coal powder is 1.5:1;

[0046] In step 2, the air carries the ultra-fine pulverized coal and is injected into the gasifier 3 from the central channel 10 of the burner 2 at the top of the gasifier; the gas velocity at the outlet of the central channel 10 is controlled to be 60 m / s;

[0047] Step 3, ig...

Embodiment 3

[0052] A method for stabilizing combustion at an ultra-low load of a coal-fired boiler based on the partial gasification of ultra-fine pulverized coal involved in this embodiment includes the following steps: using low-activity Yangquan anthracite as a raw material;

[0053] In step 1, the raw coal is sent to the ultra-fine coal mill 1, and the raw coal is ground into ultra-fine pulverized coal with a particle size of less than 45 μm, of which the ultra-fine pulverized coal with a particle size of less than 10 μm accounts for ~65%; air is carried by adjusting the air volume. The superfine coal powder is discharged from the top of the superfine coal mill 1; the mass ratio of air to superfine coal powder is 2.5:1;

[0054] In step 2, the air carries the ultra-fine pulverized coal and is injected into the gasifier 3 from the central channel 10 of the burner 2 at the top of the gasifier; the gas velocity at the outlet of the central channel 10 is controlled to be 30 m / s;

[0055] ...

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Abstract

The invention discloses an ultralow-load stable combustion method and device for a coal-fired boiler, and belongs to the technical field of power generation of coal-fired boilers. In order to solve the problem that stable combustion is difficult to maintain during deep peak-shaving low-load operation of a coal-fired unit at present, raw coal is ground into superfine pulverized coal, and the air amount is adjusted, so that the air carries the superfine pulverized coal and then is sprayed into a gasification furnace from a central channel of a burner at the top of the gasification furnace; igniting the superfine pulverized coal through a high-energy igniter in the gasification furnace; introducing mixed gas of high-temperature water vapor and air; adjusting the proportion of the pulverized coal, air and water vapor, and controlling the temperature of the gasification furnace, so that the pulverized coal, oxygen and water vapor are subjected to partial gasification reaction to generate high-temperature fuel gas rich in CO; the high-temperature fuel gas carrying the non-burnt superfine pulverized coal is sprayed into a boiler hearth through the ignition pipe, and stable pulverized coal burning in the boiler is completed. The operation cost is low, the load of the pulverized coal boiler can be reduced to 20% or below, the burn-off rate of pulverized coal is high, and the requirement for ultralow load peak regulation is met.

Description

technical field [0001] The invention belongs to the technical field of coal-fired boiler power generation, and in particular relates to a method and a device for stabilizing combustion of an ultra-low load of a coal-fired boiler. Background technique [0002] Coal-fired power plants are the main source of carbon dioxide emissions. Under the pressure of carbon emission reduction, it is a national strategic decision to build a new power system with renewable energy as the main body. However, wind and solar power generation has the characteristics of intermittency, volatility and randomness. The peak-to-valley ratio of power generation is huge, and the stability of the power grid is poor. Solving the large proportion of new energy consumption is an urgent problem that the power system needs to solve. Coal-fired power units have the characteristics of wide-load operation and flexible start and stop. Therefore, flexible transformation of thermal power and the use of coal-fired th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23D1/00F23K1/00F23K3/02F23N5/00
CPCF23D1/00F23K1/00F23K3/02F23N5/00
Inventor 赵建涛李春玉聂伟王永斌郑伟毛子刚
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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